# US 11,444,548 B2 · Single-phase device-multiplexing active power decoupling cascaded rectifier and control method thereof > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 11,444,548 B2 - Document ID: US11444548B2 - Status: Granted - Kind: B2 - Application number: 17/275,447 - Filed: 2020-06-19 - Published: 2022-02-17 - Granted: 2022-09-13 - Earliest claimed: 2019-08-06 - Assignees: Shandong University - Applicants: Shandong University - Inventors: Chunshui Du - Web page: https://patentgrep.com/patent/US11444548B2 ## CPC - H02M 1/0074: {Plural converter units whose inputs are connected in series} - H02M 7/219: in a bridge configuration - H02M 1/0003: {Details of control, feedback or regulation circuits} - H02M 1/0043: {Converters switched with a phase shift, i.e. interleaved (non-isolated DC/DC converters H02M3/1586)} - H02M 1/007: {Plural converter units in cascade (push-pull DC/DC converters with pre-regulator H02M3/3374; DC-AC converters following a DC-DC stage including a high frequency transformer H02M7/4807; DC-AC converters following a DC-DC conversion stage generating periodically varying voltages H02M7/4826)} - H02M 1/008: {Plural converter units for generating at two or more independent and non-parallel outputs, e.g. systems with plural point of load switching regulators} - H02M 1/15: using active elements - H02M 1/4233: {using a bridge converter comprising active switches} - H02M 7/05: {Capacitor coupled rectifiers} - H02M 7/217: using semiconductor devices only - H02M 7/4833: {Capacitor voltage balancing} - H02M: APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF (transformers H01F; dynamo-electric converters H02K47/00; controlling transformers, reactors or choke coils, control or regulation of electric motors, generators or dynamo-electric converters H02P) ## Abstract A single-phase device-multiplexing active power decoupling cascaded rectifier and control method thereof. The rectifier includes: n device-multiplexing active power decoupling H-bridge units that are cascaded, n≥2; each unit including: a bridge arm H1 and a bridge arm H2 connected in parallel, a decoupling capacitor branch formed by two capacitors connected in series, and a resistive load; a decoupling inductor being connected in series between a midpoint of the decoupling capacitor branch and a midpoint of bridge arm H2; and a bridge arm H1 of a first unit being sequentially connected in series to an inductor, resistor, and power supply, and then connected to a bridge arm H2 of a last unit. A power switch module of an H-bridge rectification unit is multiplexed, which not only realizes unit power factor rectification of the unit, but also provides a loop for secondary ripple power to achieve secondary ripple power decoupling control. ## Claims ### Claim 1 A control method of a multi-module single-phase device-multiplexing active power decoupling cascaded rectifier, the rectifier comprising: n device-multiplexing active power decoupling H-bridge units that are cascaded, n≥2; each device-multiplexing active power decoupling H-bridge unit comprising: a bridge arm H1 and a bridge arm H2 connected in parallel, a decoupling capacitor branch formed by two capacitors connected in series, and a resistive load; a decoupling inductor being connected in series between a midpoint of the decoupling capacitor branch and a midpoint of the bridge arm H2; and a midpoint of an bridge arm H1 of a first device-multiplexing active power decoupling H-bridge unit being sequentially connected in series to an inductor Ls, a resistor Rs, and a power supply Us, and then connected to a midpoint of a bridge arm H2 of a last device-multiplexing active power decoupling H-bridge unit, the control method comprising: adding up instantaneous voltages outputted by a controller as a total system voltage through direct current (DC)-side voltage closed-loop control; generating, according to a deviation between an instantaneous voltage Pvi of each cascaded H-bridge unit and a virtual average voltage, a DC bus voltage deviation modulation signal factor of each cascaded H-bridge unit; generating a grid-side current reference value according to the total system voltage, calculating a difference between a grid-side inductor current and the grid-side current reference value, and generating a first modulation signal through a proportional resonance (PR) controller; generating a reference value of a decoupling inductor current according to an instantaneous power Pn of each cascaded H-bridge unit, calculating a difference between the decoupling inductor current and the reference value of the decoupling inductor current, and generating a modulated wave signal of a bridge arm H2 of each cascaded H-bridge unit through the PR controller; generating a drive signal of the bridge arm H2 of each cascaded H-bridge unit after comparing the modulated wave signal of the bridge arm H2 of each cascaded H-bridge unit with a carrier signal; superimposing the modulated wave signal of the bridge arm H2 of each cascaded H-bridge unit onto the first modulation signal and then onto a respective DC bus voltage deviation modulation signal factor, to generate a modulated wave signal of a bridge arm H1 of each cascaded H-bridge unit; and generating a drive signal of the bridge arm H1 of each cascaded H-bridge unit based on the modulated wave signal of the bridge arm H1 of each cascaded H-bridge unit through a carrier phase-shifted modulation technology. ### Claim 2 (depends on 1) A terminal device, comprising a processor and a computer-readable storage medium, the processor being configured to implement instructions, the computer-readable storage medium being configured to store a plurality of instructions, the instructions being adapted to be loaded by the processor to perform the control method according to claim 1. ### Claim 3 (depends on 1) A computer-readable storage medium, storing a plurality of instructions, the instructions being adapted to be loaded by a processor of a terminal device to perform the control method according to claim 1. ### Claim 4 A control system of a multi-module single-phase device-multiplexing active power decoupling cascaded rectifier, the rectifier comprising: n device-multiplexing active power decoupling H-bridge units that are cascaded, n≥2; each device-multiplexing active power decoupling H-bridge unit comprising: a bridge arm H1 and a bridge arm H2 connected in parallel, a decoupling capacitor branch formed by two capacitors connected in series, and a resistive load; a decoupling inductor being connected in series between a midpoint of the decoupling capacitor branch and a midpoint of the bridge arm H2; and a midpoint of an bridge arm H1 of a first device-multiplexing active power decoupling H-bridge unit being sequentially connected in series to an inductor Ls, a resistor Rs, and a power supply Us, and then connected to a midpoint of a bridge arm H2 of a last device-multiplexing active power decoupling H-bridge unit, the control system comprising: a second direct current (DC) bus voltage control module, configured to add up instantaneous voltages outputted by a controller as a total system voltage through DC-side voltage closed-loop control; a voltage balance control module, configured to generate, according to a deviation between an instantaneous voltage Pvi of each cascaded H-bridge unit and an average voltage, a DC bus voltage deviation modulation signal factor of each cascaded H-bridge unit; a second unit power factor rectification module, configured to generate a grid-side current reference value according to the total system voltage, calculate a difference between a grid-side inductor current and the grid-side current reference value, and generate a first modulation signal through a proportional resonance (PR) controller; a second active power decoupling control module, configured to generate a reference value of a decoupling inductor current according to an instantaneous power Pn of each cascaded H-bridge unit, calculate a difference between the decoupling inductor current and the reference value of the decoupling inductor current, and generate a modulated wave signal of a bridge arm H2 of each cascaded H-bridge unit through the PR controller; a rectification bridge arm modulation signal generation module, configured to superimpose the modulated wave signal of the bridge arm H2 of each cascaded H-bridge unit onto the first modulation signal and then onto a respective DC bus voltage deviation modulation signal factor, to generate a modulated wave signal of a bridge arm H1 of each cascaded H-bridge unit; a rectification bridge arm drive signal generation module, configured to generate a drive signal of the bridge arm H1 of each cascaded H-bridge unit based on the modulated wave signal of the bridge arm H1 of each cascaded H-bridge unit through a carrier phase-shifted modulation technology; and a decoupling bridge arm drive signal generation module, configured to generate a drive signal of the bridge arm H2 of each cascaded H-bridge unit after comparing the modulated wave signal of the bridge arm H2 of each cascaded H-bridge unit with a carrier signal. ### Claim 5 A control method of a single-phase device-multiplexing active power decoupling cascaded rectifier, the rectifier comprising: a bridge arm H1 and a bridge arm H2 connected in parallel, a decoupling capacitor branch formed by two capacitors connected in series, and a resistive load; a decoupling inductor being connected in series between a midpoint of the decoupling capacitor branch and a midpoint of the bridge arm H2; and a midpoint of the bridge arm H1 being sequentially connected in series to an inductor Ls, a resistor Rs, and a power supply Us, and then connected to the midpoint of the bridge arm H2, the control method comprising: generating a system voltage P in a circuit operation through direct current (DC) bus voltage closed loop control; respectively generating a grid-side current reference value and a reference value of a decoupling inductor current according to the system voltage P; calculating a difference between a grid-side inductor current and the grid-side current reference value, and generating a first modulation wave through a proportional resonance (PR) controller; comparing the decoupling inductor current and the reference value of the decoupling inductor current, and generating a second modulation wave through the PR controller; superimposing the first modulation wave onto the second modulation wave for comparison with a carrier, and generating a first drive signal of a bridge arm H1 switching transistor that is used to drive rectification; and generating a second drive signal of a bridge arm H2 switching transistor that is used to drive decoupling and rectification after comparing the second modulation wave with the carrier. ### Claim 6 (depends on 5) A terminal device, comprising a processor and a computer-readable storage medium, the processor being configured to implement instructions, the computer-readable storage medium being configured to store a plurality of instructions, the instructions being adapted to be loaded by the processor to perform the control method according to claim 5. ### Claim 7 (depends on 5) A computer-readable storage medium, storing a plurality of instructions, the instructions being adapted to be loaded by a processor of a terminal device to perform the control method according to claim 5. ### Claim 8 A control system of a single-phase device-multiplexing active power decoupling cascaded rectifier, the rectifier comprising: a bridge arm H1 and a bridge arm H2 connected in parallel, a decoupling capacitor branch formed by two capacitors connected in series, and a resistive load; a decoupling inductor being connected in series between a midpoint of the decoupling capacitor branch and a midpoint of the bridge arm H2; and a midpoint of the bridge arm H1 being sequentially connected in series to an inductor Ls, a resistor Rs, and a power supply Us, and then connected to the midpoint of the bridge arm H2, the control system comprising: a first direct current (DC) bus voltage control module, configured to generate a system voltage P in a circuit operation through DC bus voltage closed loop control; a first unit power factor rectification control module, configured to generate a grid-side current reference value according to the system voltage P, compare a grid-side inductor current with the grid-side current reference value, and generate a first modulation wave through a proportional resonance (PR) controller; a first active power decoupling control module, configured to generate a reference value of a decoupling inductor current according to the system voltage P, compare the decoupling inductor current with the reference value of the decoupling inductor current, and generate a second modulation wave through the PR controller; and a first drive signal generation module, configured to superimpose the first modulation wave onto the second modulation wave for comparison with a carrier, generate a first drive signal of a bridge arm H1 switching transistor that is used to drive rectification, and generate a second drive signal of a bridge arm H2 switching transistor that is used to drive decoupling and rectification after comparing the second modulation wave with the carrier.